How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 4/5100.0*Chance in playoffs100.0*Average seed
Rosario Central 3 Palmeiras 3 +1.9
+0.0
River Plate-URU 2 Nacional 2 +0.9
+0.0
Week of 4/12100.0*Chance in playoffs100.0*Average seed
Nacional 0 Rosario Central 2 In
+0.9
Palmeiras 4 River Plate-URU 0 -13.9
-0.1
Week of 4/19None
Points
Chance Will Make Playoffs